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-rw-r--r--Documentation/admin-guide/gpio/gpio-mockup.rst11
1 files changed, 6 insertions, 5 deletions
diff --git a/Documentation/admin-guide/gpio/gpio-mockup.rst b/Documentation/admin-guide/gpio/gpio-mockup.rst
index 9fa1618b3adc..493071da1738 100644
--- a/Documentation/admin-guide/gpio/gpio-mockup.rst
+++ b/Documentation/admin-guide/gpio/gpio-mockup.rst
@@ -17,17 +17,18 @@ module.
gpio_mockup_ranges
This parameter takes an argument in the form of an array of integer
- pairs. Each pair defines the base GPIO number (if any) and the number
- of lines exposed by the chip. If the base GPIO is -1, the gpiolib
- will assign it automatically.
+ pairs. Each pair defines the base GPIO number (non-negative integer)
+ and the first number after the last of this chip. If the base GPIO
+ is -1, the gpiolib will assign it automatically. while the following
+ parameter is the number of lines exposed by the chip.
- Example: gpio_mockup_ranges=-1,8,-1,16,405,4
+ Example: gpio_mockup_ranges=-1,8,-1,16,405,409
The line above creates three chips. The first one will expose 8 lines,
the second 16 and the third 4. The base GPIO for the third chip is set
to 405 while for two first chips it will be assigned automatically.
- gpio_named_lines
+ gpio_mockup_named_lines
This parameter doesn't take any arguments. It lets the driver know that
GPIO lines exposed by it should be named.